Heating guns



G. VAN DAAM July 2, 1946.

HEATING GNs' Filed oct. 1, 1945' 2 sheets-sheet 1 July 2, 1946. G, VANDAAM 2,403,415

` HEATING GUNS l Filed oct. 1, 1945 A 2 sheets-sheet 2 25 f6. mzl

Patented July 2, 1946 i Y i UNITED STATES PATENT OFFICE HEATING GUNS.; y

Gerrit Van Daam, Buffalo, N. Y.

Application October 1, 1943, vSerial No. 504,597 4 claims. (ci. 21e- 19)l 2 This invention relates to heating guns. sistance element, showingdepressions in the face The object is to provide such means equallythereof. adapted for mounting the heater either on the Fig. 5 is asection on the line 5 5 of Fig. 4, right hand or left hand side of thegun. on an enlarged scale.

It is common practice to manufacture gun 5 Fig. 6 is a Similar v iew ofthe side heater eleheaters especially for the right hand or the leftment Without deDreSSlOnS- hand mounting. This practice is inconvenientFig. 'i is a side elevation 0f theV housing for and expensive. It istherefore the object of the the main resistance. l v present inventionto provide means equally ap- Figs. 8 and 9 are vleWS in perspectlve ofcompiioabie for right hand or left hand mounting. 10 plementary parts 0fthe housing for the 'side Such a device is especially useful withAircraft heater element.

guns or the like. By the use of this device such Figs- 10 andil arediagrams'of Suitable wiring.Y heaters are readily changeable from onetype to Similar numerals refer v t0 Similar Darts the other, withoutsubstantial expense or delay. thrOUghOut the Several vieWS.

By the use of my improved device the heater Referring to Fig. 1: lassembly can be used on either the right hand The frame 2| iS providedfOr Supporting and or left hand side of the gun withoutinterferadjusting the heating element 22, Which iS e11- ing with anyattachments which may be mounted closed in the housing or box-likeformation 23. on the guns. This heating element is preferably anelectric Another object of my invention is to provide 2O resistancewhich may be in the'nature of a fabri an efficient heater for guns wherethe heaters cated sheet- The face or front wall 24 of the housing isprovided with concavo-convex formations 25 and 26, which appear on theinner side of said Wall Y as convex projections. These formations arearranged diagonally in said face 24.

Only one formation is engaged for right-hand mounting to keep the heaterassembly in proper location. For left-hand mounting, the assemblynaturally is turned around, thus engaging the other formation, leaving,in either case, one formation not in use.

alone are in thermal contact with the gun, thus assuring the efficientheat transfer to the gun Without conducting some heat to the frame. This25 is accomplished by the use of insulating bodies and means ofsupporting springs between the heater and the frame.

Another object of my invention is to provide a heater which can beremoved or replaced without the loss of the main part of the assembly.

By sealing the seams of the unit or heater housing I make themwater-proof to avoid any All th e guns of this type, especially machmeVapor or water seepmg through the seams. guns, have only one projectionAnother Object (.f my inverttion is to provide a' 35 The fabricatedresistance sheet 22, which forms heater readlly adiustable, with meansto avold with its housing the main heater is provided any liciing effec?which may take place when the with similar concave-convex formations 25and gun 1s in operation. 26, and are pressed between the registeringfor- The Invent/10H also Comp'lses means for PTO' mations on the plate24 and the surface of the tecting the resistance Wire against abrasionsand 40 gun body 21 when the same @gisten The presgrounds, by insulatingthe bare resistance wire Sure is under a stiff Spring 23, so that anexwith fibreglass yarn before they are fabricated tremely effectivepressure contact is maintained into a unitbetween said distortions whenthe same are in The invention comprises such means and also registel;

other improvements in connection with such in- When the properdepression `in the face 24 vention, as will be described. of the heateris brought into register with the Referring to the drawings, whichillustrate projection 39 on the gun surface, the desired merely by wayof example, suitable means for result is achieved.

effecting my invention; The preferred insulation between the heater Fig.1 is a view in perspective of the device 50 and the gun surface, is mica40 or similar mateembodying my invention; said device being shown rial,which provides an effective electrical insuas standing on end. lationwhile having effective heat conductivity. Fig. 2 is a section on theline 2-2 of Fig. 1. The preferred insulation between the heater and Fig.3 is a section on the line 3 3 of Fig. 1. the frame, should be highlyeiective to both heat Fig. 4 is a perspective view of a fabricated re-55 and electrical insulation as above indicated.`

As stated, 2| indicates the frame for carrying the heater 22 to thesurface of the gun body 2]. The frame 2| is provided with side walls orfianges having suitable spring clips 28 to hold the parts in properrelative and co-acting relationship, and especially insuring effectivecontact between the heater and the gun surfaces.

The side heater 29 is provided with a supporting sleeve 30, slidablymounted on the rod 3|, secured to the frame 2l. This arrangement is forpurposes of adjustment relatively to either right or left-hand positionof the main heater, as herein described.

The side heater formation 29 comprises a receptacle 32 for receiving theheating element, and a cover 33 for enclosing the same. This cover orclosure 33 has a fitting engagement with the receptacle. A resilientstrip 34 is secured to the receptacle body having a bend 35 at its freeend engaging a guide 33, thus providing an additional guide and supportfor the side heater. A leaf-spring 31 between the two elements 32 and33, serves to maintain effective pressure upon the surface of the gun.

The preferred insulation for the resistance comprises mica between theheater 22 and the gun surface, and glass wool or the like, as at 4l,sho-uld be used between the heater and the frame.

The main heater 22 and the side wall heater 23 are provided with thespring 31 and spring 38 for securing even resilientl pressures betweensaid heaters and the surfaces of the gun.

Figs. and 11 show preferred schemes for the wiring of the heatingelements.

What I claim is:

LA heating device for guns, comprising an electrical resistance, ahousing enclosing the same, a frame for securing the heater to the gunfor right-hand or left-hand position, the gun having a Contact surfaceprovided with a, convex formation, the housing having a contact faceprovided with tWo spaced apart concavo formations each of which isadapted for selective registration with said convex formation, andresilient means for insuring effective contact between the heater andthe gun.

2. A heating device for guns, comprising an electrical resistance, ahousing enclosing the same, a frame for securing the heater to the gunfor right-hand or left-hand position, the gun having a contact surfaceprovided with a convex formation, the housing having a contact faceprovided with two spaced apart concavo formations each of which isadapted for selective registration with said convex formation, andresilient means for disengageably securing the housing to the frame.

3. A heating device for guns, comprising an electrical resistance, ahousing enclosing the same, a frame for securing the heater to the gunfor right-hand or left-hand position, the gun having a contact surfaceprovided with a convex formation, the housing having a contact faceprovided with two spaced apart concavo formations each of Which isadapted for selective registration with said convex formation, andresilient means for disengageably securing the frame to the gun ineither right-hand or left-hand position.

4. A heating device for guns, comprising an electrical resistance, ahousing enclosing the same, a frame for securing the heater to the gunfor right-hand or left-hand position, the gun having a contact surfaceprovided with a convex formation, the housing having a contact faceprovided with two spaced apart concavo formations each of which isadapted for selective registration with said convex formation, and aside heater pivotally secured to the frame and provided with resilientmeans for securing effective contact with a side surf ace of the gun.

GERRIT VAN DAAM.

